Air cleaner



Oct. 28. 1924. 1,513,035

F. A. DONALDSON AIR CLEANER Original Filed Nov. 12. 1921 ,w Han/r /4 Dana/0500 )[a/l/jn a Patented Oct. 28, 19 24.

UNITED STATES.

PATENT OFFICE.

FRANK A. DONALDSO'N, OF MINNEAPOLIS, MINNESOTA.

Am CLEANER. i A

- Original application filed November 12, 1921, serial No. 514,628. Divided and this, application filed August a1, 1923. Serial No. '660,411.

To all whom it may concern:

Be it known that I, FRANK A. DoNALnsoN,

a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Air Cleaners; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to air cleaners for use in connection with carbureternal surface, and provides an arrangement in which the air, entering the dust collector,

is caused to take up'a whirling motion immediately around and in contact with the filter. This novel relative arrangement accomplishes highly important results, as will hereinafter more fully appear. 7

In the accompanying drawings, which illustrate the invention, like characters indicatelike parts throughout the several views. I

Referring to the drawings: 1

Fig. 1 is a vertical axial section illustrating one form of my improved air cleaner and showing the same connected to the intake of the carbureter of an internal combustion engine; and

Fig. 2 is a horizontal section taken on the line 22 of Fig. 1.

In the following detail description, the parts of the carburetor are indicated by the same numerals or characters that were applied thereto in the original application above identified and of which the present application is a division.

v The main or body member of the air cleaner, as shown, is in the form of a cylindrical shell 49 that is provided with air intake ports 35, hopper bottom 50, baflie plate 34, and jar or dust receptacle 33. The circumferentially spaced air intake ports 35 are formed by inwardly pressed lips that in- 0 11118 circumferentially in a commondirection, so that they cause the air, introduced into the shell, to immediately take up a whirling motion. The baffle plate 34 is a sort-of a many-sided pyramid,the rim of which contacts with the hopper bottom 50 only at certain points, so that the precipitated dust can slide freely on the hopper bottom into the dustreceptacle or jar 33.

The shell t9 is shown as provided with an annular top plate formed with a large threaded neck or sleeve 56 that adapts it to be detachably connected to the depending threadedannular flange of a cap 57, which latter has an air discharge or delivery tube or pipe 58.. This air discharge tube 58 is connected to the intake of a carburetor 20, such as generally used in connection with internal combustion engines. The hollow filter shown is of inverted conical form and preferably comprises a filtered fibrous body 59 impregnated with oil and contained between inner and outer woven wire cones 60, secured to a sheet metal collar 60; This filter is detachably supported on an annular flange 61 secured to the top of the shell 49 and adapted, when said shell is unscrewed from the relatively fixed cap 57 to be readily lifted from position, cleaned, and returned to position.

In the construction just described and illustrated, it is important to note that the filter itself projects below the air intake ports 35, or, in other words and more broadly stated, is surrounded by the said air intake ports, so that the air will begin its whirling movement within the shell 49 immediately around and more or less in contact with the lower or adjacent surface of the filter.

With this arrangement, as the air whirls within the casing, the greater part ofthe dust will, by the action of centrifugal force and gravity, be directly precipitated into the dust receptacle 33. Some of the dust,

however, will be drawn against the filter, but the whirling or spiral downward moveinto the 'ar or dust receptacle. Some of the dust whlch strikes the filter will be held thereby, so that, inthe course of time, the

"filter should be removed, cleaned, and replaced in position. It will thus be seen that the whirling air in the casing has, to a considerable extent, a self-cleaning action of the filter.

. From the statements made, it will, of course, be understood that the invention herein disclosed is capable of, various modifications as to form and relative arrangement, all within thescope of the claims.

What I claim is: A

1. An air cleaner comprising. an outer casing having peripheral tangential air in-- take means and an axial air-outlet passage, a hollow filter inserted into said casing with its interior connected to said discharge passage and with its exterior directly exposed substantially in line with the axis of said intake to the air drawn into the casing throu h said air intake means.

2. 11 air cleaner comprising a shell and within the shell a dust filter, said shell having on one, side of said filter an air-outlet passage adapted to be connected to the intake of a carburetor and provided on the other side of said filter with peripheral tangential inlet means directly adjacent to the side wall of the filter, the said filter beans-pas ing insertable, and removable through the top of said shell, said filter having its exteriordirectly exposed'substantially in line with the axis of said intake.

3. The structure defined in claim 2 in which said air inlet means is arranged to set filter.

4. 'An air cleaner comprising a shell and within the shell a dust fi ter, said shell having on one side of said filter an air-outlet up a whirlin motion of the air direct] ad- Jacent to an against the sidewallo said 5. An air cleaner comprisin an outer cas-- peripheral tangen ial air intake posed substantially in line withthe axis of said intake, to the air drawn into the casing through said air intake means.

- In testimony whereof I afiix my signature.

FRANK A. DONALDSON. 

